new event "nice guy"

hi to all, I try to speak English, so I apologize if I'm not precise. since I only miss the "nice guy" event to complete the other event "may madness" (which I get as a prize 50 crates and permanent grenade) I wanted to know if, obligatorily, I had to do 250 kill each character or only 50 each character, and if I have to do it every day until 29 or just one day. thank you so much